不推荐使用ConnectivityManager getNetworkInfo（int）

Question

使用compileSdkVersion 23，但是尝试支持9到9。

getNetworkInfo（int）在23中已弃用。建议改为使用getAllNetworks和getNetworkInfo（Network）。然而，这两者都需要最少的API 21。

我们可以在支持包中使用哪个类可以帮助解决这个问题吗？

我知道before提出了一个解决方案，但是我对9的最低api要求的挑战造成了问题。

Answer 1

您可以使用：

getActiveNetworkInfo（）;

        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
        if (activeNetwork != null) { 
            // connected to the internet
            if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI) {
                // connected to wifi
            } else if (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) {
                // connected to mobile data
            }
        } else {
            // not connected to the internet
        }

或者在开关盒中

        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
        if (activeNetwork != null) { 
            // connected to the internet
            switch (activeNetwork.getType()) {
                case ConnectivityManager.TYPE_WIFI:
                    // connected to wifi
                    break;
                case ConnectivityManager.TYPE_MOBILE:
                    // connected to mobile data
                    break;
                default:
                    break;
            }
        } else {
            // not connected to the internet
        }

Answer 2

最好检查您的网络是否连接到Internet：

@Suppress("DEPRECATION")
fun isNetworkAvailable(context: Context): Boolean {
    try {
        val cm = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
        return if (Build.VERSION.SDK_INT > 22) {
            val an = cm.activeNetwork ?: return false
            val capabilities = cm.getNetworkCapabilities(an) ?: return false
            capabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)
        } else {
            val a = cm.activeNetworkInfo ?: return false
            a.isConnected && (a.type == ConnectivityManager.TYPE_WIFI || a.type == ConnectivityManager.TYPE_MOBILE)
        }
    } catch (e: Exception) {
        e.printStackTrace()
    }
    return false
}

Answer 3

检查互联网

    @RequiresPermission(allOf = [Manifest.permission.ACCESS_NETWORK_STATE, Manifest.permission.INTERNET])
    fun isInternetAvailable(context: Context): Boolean {
    val connectivityManager = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager?
    val activeNetworkInfo = connectivityManager!!.activeNetworkInfo
    return activeNetworkInfo != null && activeNetworkInfo.isConnected
}

Answer 4

我们可能需要多次检查互联网连接。因此，如果我们在Context的扩展方法中编写代码块，对我们来说会更容易。以下是Context和Fragment的助手扩展。

检查Internet连接

fun Context.hasInternet(): Boolean {
    val connectivityManager = getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
    return if (Build.VERSION.SDK_INT < 23) {
        val activeNetworkInfo = connectivityManager.activeNetworkInfo
        activeNetworkInfo != null && activeNetworkInfo.isConnected
    } else {
        val nc = connectivityManager.getNetworkCapabilities(connectivityManager.activeNetwork)
        if (nc == null) {
            false
        } else {
            nc.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR) ||
                    nc.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)
        }
    }
}

其他扩展

fun Context.hasInternet(notifyNoInternet: Boolean = true, trueFunc: (internet: Boolean) -> Unit) {
    if (hasInternet()) {
        trueFunc(true)
    } else if (notifyNoInternet) {
        Toast.makeText(this, "No Internet Connection!", Toast.LENGTH_SHORT).show()
    }
}

fun Context.hasInternet(
    trueFunc: (internet: Boolean) -> Unit,
    falseFunc: (internet: Boolean) -> Unit
) {
    if (hasInternet()) {
        trueFunc(true)
    } else {
        falseFunc(true)
    }
}

fun Fragment.hasInternet(): Boolean = context!!.hasInternet()

fun Fragment.hasInternet(notifyNoInternet: Boolean = true, trueFunc: (internet: Boolean) -> Unit) =
    context!!.hasInternet(notifyNoInternet, trueFunc)

fun Fragment.hasInternet(
    trueFunc: (internet: Boolean) -> Unit, falseFunc: (internet: Boolean) -> Unit
) = context!!.hasInternet(trueFunc, falseFunc)

Answer 5

由于发布的答案只允许您查询活动网络，这里是如何为任何网络获取NetworkInfo，而不仅仅是活动网络（例如Wifi网络）（抱歉，Kotlin代码提前）

(getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager).run {
    allNetworks.find { getNetworkInfo(it).type == ConnectivityManager.TYPE_WIFI }?.let { network -> getNetworkInfo(network) }
//    getNetworkInfo(ConnectivityManager.TYPE_WIFI).isAvailable // This is the deprecated API pre-21
}

这需要API 21或更高版本以及权限android.permission.ACCESS_NETWORK_STATE

Answer 6

以下是我在最新的Android版本上检查当前网络是否使用手机的方法：

val isCellular: Boolean get() {
    val cm = getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
    return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        cm.getNetworkCapabilities(cm.activeNetwork).hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)
    } else {
        cm.activeNetworkInfo?.type == ConnectivityManager.TYPE_MOBILE
    }
}

Answer 7

（几乎）所有答案都在Android P中弃用，所以这里是C#解决方案（Java开发人员很容易理解）

public bool IsOnline(Context context)
{
    var cm = (ConnectivityManager)context.GetSystemService(Context.ConnectivityService);

    if (cm == null) return false;

    if (Build.VERSION.SdkInt < BuildVersionCodes.M)
    {
        var ni = cm.ActiveNetworkInfo;

        if (ni == null) return false;

        return ni.IsConnected && (ni.Type == ConnectivityType.Wifi || ni.Type == ConnectivityType.Mobile);
    }

    return cm.GetNetworkCapabilities(cm.ActiveNetwork).HasTransport(Android.Net.TransportType.Wifi)
        || cm.GetNetworkCapabilities(cm.ActiveNetwork).HasTransport(Android.Net.TransportType.Cellular);
}

这里的关键是Android.Net.TransportType

Answer 8

public boolean isConnectedToWifi(Context context) {
    ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    if (connectivityManager == null) {
        return false;
    }

    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
        Network network = connectivityManager.getActiveNetwork();
        NetworkCapabilities capabilities = connectivityManager.getNetworkCapabilities(network);
        if (capabilities == null) {
            return false;
        }
        return capabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI);
    } else {
        NetworkInfo networkInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
        if (networkInfo == null) {
            return false;
        }
        return networkInfo.isConnected();
    }
}

Answer 9

至于2018年10月，已接受的答案已被弃用。

getType()和类型本身现已在API Level 28中弃用。来自Javadoc：

呼叫者应切换到使用NetworkCapabilities＃TRANSPORT *常量之一检查NetworkCapabilities＃hasTransport

为了使用NetworkCapabilities，你需要将Network实例传递给getNetworkCapabilities()方法。要获得该实例，您需要调用在API级别23中添加的getActiveNetwork()。

所以我现在相信安全检查您是否连接到Wi-Fi或蜂窝网络的正确方法是：

public static boolean isNetworkConnected() {
    final ConnectivityManager cm = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);

    if (cm != null) {
        if (Build.VERSION.SDK_INT < 23) {
            final NetworkInfo ni = cm.getActiveNetworkInfo();

            if (ni != null) {
                return (ni.isConnected() && (ni.getType() == ConnectivityManager.TYPE_WIFI || ni.getType() == ConnectivityManager.TYPE_MOBILE));
            }
        } else {
            final Network n = cm.getActiveNetwork();

            if (n != null) {
                final NetworkCapabilities nc = cm.getNetworkCapabilities(n);

                return (nc.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR) || nc.hasTransport(NetworkCapabilities.TRANSPORT_WIFI));
            }
        } 
    }

    return false; 
}

您还可以查看其他类型的TRANSPORT，您可以找到here。

重要提示：如果您连接到Wi-Fi和VPN，那么您当前的状态可能是TRANSPORT_VPN，因此您可能还想检查它。

不要忘记将以下权限添加到AndroidManifest文件中：

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

Answer 10

更新回答（19：07：2018）：

此方法将帮助您检查互联网连接是否可用。

public static boolean isNetworkAvailable(Context context) {
    ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

    if (connectivityManager != null) {
        NetworkInfo activeNetwork = connectivityManager.getActiveNetworkInfo();
        return (activeNetwork != null && activeNetwork.isConnectedOrConnecting());
    } else {
        return false;
    }
}

老答案：

为了最好的代码重用实践，即兴创作奶酪面包答案。

public static boolean isNetworkAvailable(Context context) {
    int[] networkTypes = {ConnectivityManager.TYPE_MOBILE,
            ConnectivityManager.TYPE_WIFI};
    try {
        ConnectivityManager connectivityManager =
                (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        for (int networkType : networkTypes) {
            NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
            if (activeNetworkInfo != null &&
                    activeNetworkInfo.getType() == networkType)
                return true;
        }
    } catch (Exception e) {
        return false;
    }
    return false;
}

代码可以放在Util类中，可用于检查手机是否通过Wifi或移动互联网从应用程序的任何部分连接到Internet。

Answer 11

接受的答案在28 (Android P)中再次被弃用，但其替换方法仅适用于23 (Android M)。为了支持旧设备，我编写了一个辅助函数。

如何使用：

int type = getConnectionType(getApplicationContext());

它返回一个int，您可以在代码中将其更改为enum：

0：没有互联网可用（可能在飞机模式下，或在加入Wi-Fi的过程中）。

1：移动电话（移动数据，3G / 4G / LTE等）。

答：在。

您可以复制Kotlin或Java版本的辅助函数。

科特林：

@IntRange(from = 0, to = 2)
fun getConnectionType(context: Context): Int {
    var result = 0 // Returns connection type. 0: none; 1: mobile data; 2: wifi
    val cm = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager?
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        cm?.run {
            cm.getNetworkCapabilities(cm.activeNetwork)?.run {
                if (hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) {
                    result = 2
                } else if (hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)) {
                    result = 1
                }
            }
        }
    } else {
        cm?.run {
            cm.activeNetworkInfo?.run {
                if (type == ConnectivityManager.TYPE_WIFI) {
                    result = 2
                } else if (type == ConnectivityManager.TYPE_MOBILE) {
                    result = 1
                }
            }
        }
    }
    return result
}

Java的：

@IntRange(from = 0, to = 2)
public static int getConnectionType(Context context) {
    int result = 0; // Returns connection type. 0: none; 1: mobile data; 2: wifi
    ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        if (cm != null) {
            NetworkCapabilities capabilities = cm.getNetworkCapabilities(cm.getActiveNetwork());
            if (capabilities != null) {
                if (capabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) {
                    result = 2;
                } else if (capabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)) {
                    result = 1;
                }
            }
        }
    } else {
        if (cm != null) {
            NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
            if (activeNetwork != null) {
                // connected to the internet
                if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI) {
                    result = 2;
                } else if (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) {
                    result = 1;
                }
            }
        }
    }
    return result;
}

Answer 12

正如Cheese Bread建议的那样，使用getActiveNetworkInfo（）

getActiveNetworkInfo

在API级别1中添加

NetworkInfo getActiveNetworkInfo（）

返回有关当前活动的默认数据网络的详细信息连接时，此网络是传出连接的默认路由。在启动网络流量之前，您应该始终检查isConnected（）。当没有默认网络时，这可能返回null。此方法要求调用者持有权限ACCESS_NETWORK_STATE。返回NetworkInfo当前默认网络的NetworkInfo对象，如果当前没有默认网络，则返回null。

参考：Android Studio

 public final boolean isInternetOn() {

    // get Connectivity Manager object to check connection
    ConnectivityManager connec =
            (ConnectivityManager)getSystemService(getBaseContext().CONNECTIVITY_SERVICE);

    // Check for network connections
    if ( connec.getActiveNetworkInfo().getState() == android.net.NetworkInfo.State.CONNECTED ||
            connec.getActiveNetworkInfo().getState() == android.net.NetworkInfo.State.CONNECTING ) {

        // if connected with internet

        Toast.makeText(this, connec.getActiveNetworkInfo().getTypeName(), Toast.LENGTH_LONG).show();
        return true;

    } else if (
            connec.getActiveNetworkInfo().getState() == android.net.NetworkInfo.State.DISCONNECTED ||
                    connec.getActiveNetworkInfo().getState() == android.net.NetworkInfo.State.DISCONNECTED  ) {

        Toast.makeText(this, " Not Connected ", Toast.LENGTH_LONG).show();
        return false;
    }
    return false;
}

现在调用方法，安全使用try catch

     try {
     if(isInternetOn()){ //connected actions }
    else{
    //not connected actions }

        }catch (Exception e){
            Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show();
        }

别忘了添加：

    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

Answer 13

要检查您是否在线：

boolean isOnline() {
    // Checking internet connectivity
    ConnectivityManager connectivityMgr = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNetwork = null;
    if (connectivityMgr != null) {
        activeNetwork = connectivityMgr.getActiveNetworkInfo();
    }
    return activeNetwork != null;
}

获取android M之前/之后的互联网连接类型

void internetType() {
    // Checking internet connectivity
    ConnectivityManager connectivityMgr = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNetwork = null;
    if (connectivityMgr != null) {
        activeNetwork = connectivityMgr.getActiveNetworkInfo();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            NetworkCapabilities nc = connectivityMgr.getNetworkCapabilities(connectivityMgr.getActiveNetwork());
            if (nc.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)) {
                // connected to mobile data
            } else if (nc.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) {
                // connected to wifi
            }
        } else {
            if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI) {
                // connected to wifi
            } else if (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) {
                // connected to mobile data
            }
        }
    }
}

所有情况都需要访问网络状态的权限

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

Answer 14

为了安全起见，我建议也使用方法

NetworkInfo.isConnected（）

The whole method could be as below:

/**
 * Checking whether network is connected
 * @param context Context to get {@link ConnectivityManager}
 * @return true if Network is connected, else false
 */
public static boolean isConnected(Context context){
    ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
    if (activeNetwork != null && activeNetwork.isConnected()) {
        int networkType = activeNetwork.getType();
        return networkType == ConnectivityManager.TYPE_WIFI || networkType == ConnectivityManager.TYPE_MOBILE;
    } else {
        return false;
    }
}

Answer 15

Kotlin版本：

fun isInternetOn(context: Context): Boolean {
   val cm = context.getSystemService(Context.CONNECTIVITY_SERVICE) as? ConnectivityManager
   val activeNetwork = cm?.activeNetworkInfo
   return activeNetwork != null && activeNetwork.isConnected
}

Answer 16

接受的答案在版本28中已弃用，因此这是我在项目中使用的解决方案。

返回连接类型。 false：没有Internet连接; true：移动数据||无线上网

public static boolean isNetworkConnected(Context context) { 
            boolean result = false; 
            ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                if (cm != null) {
                    NetworkCapabilities capabilities = cm.getNetworkCapabilities(cm.getActiveNetwork());
                    if (capabilities != null) {
                        if (capabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) {
                            result = true;
                        } else if (capabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)) {
                            result = true;
                        }
                    }
                }
            } else {
                if (cm != null) {
                    NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
                    if (activeNetwork != null) {
                        // connected to the internet
                        if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI) {
                            result = true;
                        } else if (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) {
                            result = true;
                        }
                    }
                }
            }
            return result;
        }

不推荐使用ConnectivityManager getNetworkInfo（int）

问题描述投票：89回答：14

14个回答

The whole method could be as below:

最新问题

不推荐使用ConnectivityManager getNetworkInfo（int）

问题描述 投票：89回答：14

14个回答

The whole method could be as below:

最新问题

问题描述投票：89回答：14